ER20 Collet

thingiverse

I wanted to create a collet tray for my ER20 collets, so I designed these collet models to help me make it. I discovered that the measurements and standards differ slightly, so I came up with 3 different designs. The inch model is based on the drawing I found on the MariTool website, the metric model is based on the drawing I found on AliExpress, and the measured model is based on my own caliper work with the set of DrillPro collets that I ordered from BangGood. All 3 models are based on the same 30-degree nose and 8-degree tail, because that specific design was consistent in both drawings (and I don't have an accurate way to measure it myself). All three designs vary slightly, but the collets that I measured appear to be closer to the 'inch' drawing's dimensions. Still, I decided to include all 3 in case you experience a different outcome. My collets from BangGood also seem to all have a 10mm ID on the back side, so that's the size of the through hole that I added to these designs. Your results may vary. Inches: https://www.maritool.com/Collets-ER-Collets-ER20-Collets/c21_56_62/index.html Metric: https://www.aliexpress.com/item/ER25-collets-4mm/523793862.html Measured: https://www.banggood.com/13pcs-1-13mm-ER20-CNC-Carving-Machine-Milling-Chuck-Collets-p-957223.html?cur_warehouse=CN Drawn with DesignSpark Mechanical. RSDOC source file included.